City of Melbourne – Preparation of road and park surface polygons

To assist with the registration and management of road and park assets, Council needed a series of surface polygons over the roads and parks within the municipality.


Preparation of Road and Park Surface Polygons

Background

The City of Melbourne is developing and configuring an asset management software solution for all Council assets. To assist with the registration and management of road and park assets, Council needed a series of surface polygons over the roads and parks within the municipality.

Objective

A fully defined set of discrete polygons that represent particular assets within all roads and parks. The polygon boundaries were defined according to prescribed attributes including classification, type and material. Generally each polygon will represent a discrete asset within Council’s AMS.

Scope of Services

Compile discrete polygons for all roads, reserves and parks under Council’s control including:

  • Roadways and reserves
  • Park areas within public land and Council controlled land
  • Medians, roundabouts, splitter islands and physical lane delineation devices within roadways
    Bridges, waterways and watercourses.
The following assets were defined by polygons:
Footpaths
Kerbs
Kerb & channels
Roadways
Medians
Roundabouts
Off-road pedestrian & bike paths
Traffic islands
Nature strips
Tramways
Tram super stops
Shrub beds (incl. garden beds)
Turf areas
Open drains
Waterways
Watercourses
Bridges
Retaining walls
Important considerations affecting the definition of a polygon include:

  • Ensuring polygon boundaries are contiguous (ie. no overlapping or gaps)
  • Maintaining spatial accuracy
  • Creating line work that is geometrically correct and continuous
Council provided existing datasets including:

  • Photogrammetric data of the relevant areas (varied between 1994 and 2002)
  • Aerial photography
  • Street and pathway segment information
  • Park feature surveys where available
  • CAD Layers for infrastructure

Methodology

The methodology was complex and included:

  • Evaluation of existing datasets and extraction of existing line work
  • CAD plotting
  • GIS data manipulation
  • Cross section surveys
  • High accuracy GPS surveys
  • Total station feature surveys
  • Field verification of materials and other attributes
  • Topology checks and GIS data cleansing

Outputs

Project deliverables included:

  • An ArcMap shapefile showing all surface polygons and all required attributes
  • An Excel spreadsheet containing the polygon ID, location, asset classification and surface material.
  • A report of the project outlining any issues, constraints or techniques that the Consultant wishes to raise with Council.

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